ci: use zola container action

Author: kanru

.github/actions/zola-build/action.yml

@@ -0,0 +1,7 @@
+name: zola-build
+description: build website with zola
+runs:
+  using: docker
+  image: docker://ghcr.io/getzola/zola:v0.22.1
+  args:
+    - build

.github/workflows/ci.yml

@@ -0,0 +1,11 @@
+name: Build
+on:
+  pull_request:
+    branches:
+      - "master"
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/zola-build